<title>on/offline event capture</title>
<style>
li {
  font-weight: bold;
}
li::before {
  font-weight: normal;
}
</style>
<article>
  <p>Test required here: File -> Work Offline - toggle the value and there <em>should</em> be three list items notifying of online and offline.</p>
  <ul>
    <li>via body "on" events: <span id="viabody"></span></li>
    <li>via window "on" events: <span id="viaon"></span></li>
    <li>via window.addEventListener: <span id="vialistener"></span></li>
  </ul>
  <p>Note that the test shows that <code>window.ononline</code> and <code>window.onoffline</code> doesn't work (which I thought I had read in the specs somewhere...).</p>
</article>
<script>
function update(online) {
  document.getElementById('viabody').innerHTML = navigator.onLine ? 'Online' : 'Offline';
}

addEvent(window, 'online', function () {
  document.getElementById('vialistener').innerHTML = 'Online';
});

addEvent(window, 'offline', function () {
  document.getElementById('vialistener').innerHTML = 'Offline';
});

window.ononline = function () {
  document.getElementById('viaon').innerHTML = 'Online';
};

window.onoffline = function () {
  document.getElementById('viaon').innerHTML = 'Offline';
};

document.body.onOnline = update;
document.body.onOffline = update;

// document.body.onload = update;
 
</script>